Most municipalities already warn in a general sense, via signs, usually at city limits, of traffic-law and speed enforcement; and some states have decided that it's legal for motorists to give alerts to others—in primitive form via headlights, for instance, or through more sophisticated electronic information via apps like Trapster.

The man's case is headed to a municipal court. Based on local reports, it's unclear if the motivations of this man and the arresting officers are as straightforward as said. How and to what degree can we inform others about 'hidden' speed enforcement?

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